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The Bobolink and Screaming Cowbird can be distinguished primarily by their plumage and behavior. The Bobolink, especially in breeding males, has a striking black and white pattern with a yellow cap, while the Screaming Cowbird is more uniformly dark. Behaviorally, Bobolinks are often seen in open fields, whereas Screaming Cowbirds are more associated with parasitizing other bird species' nests.

Look for the yellow cap and white back of the breeding male Bobolink. Note the uniform dark plumage of the Screaming Cowbird. Observe behavior: Bobolinks in open fields, Screaming Cowbirds near other birds' nests.

Breeding male Bobolinks have a distinctive black body with white back and yellow cap, making them easily distinguishable from the uniformly dark Screaming Cowbird. Female and nonbreeding Bobolinks are more subdued in color but still differ from the Screaming Cowbird's consistent dark plumage.

Bobolinks are often seen in open fields and grasslands, where they forage on the ground. In contrast, Screaming Cowbirds are known for their brood parasitic behavior, often found near the nests of other bird species.

Bobolinks prefer open fields and grasslands, while Screaming Cowbirds are more commonly found in areas where they can parasitize the nests of other birds.